Locking device



Dec. 12, 1944.

E. 'F. WICKENS 2,365,031

LOCKING DEVICE Filed March 25, 1942 HI 31% l' l. 40%) N Eg-Z.

a6 is 52 I f 55 36 E INVENTOR fldwardflmekens.

Y B M.

HIS ATTORNEY.

Patented Dec. 12, 1944 STATES D EF FCE '2,365,ll31 r ...LOGKING .DEVIGEEdward F. *Wickens'iPhillilisburg'f NIL; as'signor to I Ingerso'll-Rand"Company; New"YorkfiN. Y, a :porporatiomoFNew Jersey I i aApplication Marcht25, 1942;.-Serial No.-4-36;2-16

(cum-=) 2 Claims.

.t'llh-isriinventionr relates to. locking devices," andr-.moreyrparticularly to ai1ocking-"-device% for -pre-- venting relativewrotation :betweenv a "pair "of threadedly connected members.

One object of the invention is to effectively preto tventxiun-threadingt ofionermember from the other and also to entirelypreclude movement of the locking element from the locking position, and

Another object is to enable the locking device to be expeditiouslyapplied to the members which it is intended to lock together.

Other objects will be in part obvious and in part pointed outhereinafter.

In the drawin accompanying this specification and in which similarreference numerals refer to similar parts,

Figure 1 is an elevation, partly in section, of a forging machine havingthe invention applied thereto, and

Figure 2 is a similar view of a detail.

Referring more particularly to the drawing, 29 designates a forgingmachine shown as being in the form of a drill sharpener. The machinecomprises a base 2| that supports a clamping cylinder 22 containing apiston 23 for reciprocat ing the hammer element of the forging machine.

Superimposed upon the cylinder 22 is an anvil block 24 which has a bore25 to receive, slidably, a column 26 having'mounted on its upper portion a crosshead 21. The crosshead 21 may be affixed to the column 26 inany suitable manner and in the opposed surfaces of the crosshead and theanvil block are complementary die members 29 for forging a work piece.

The interior of the base 2| constitutes a reservoir 29 for pressurefluid which is conveyed into the reservoir by a supply conduit 30, andin the upper portion of the base is a supply passage 3| for conveyingpressure fluid from the reservoir to distributing valve mechanism 32 onthe side of the cylinder 22.

Only the chest 33 of the valve mechanism is shown and the valve itencases may be actuated, in a well known manner, by a crank 34 adjacentthe valve chest. The pressure fluid distributed by the valve mechanismflows to the upper and lower ends of the cylinder 22 through passages 35and 36, respectively and the exhaust of such pressure fluid may alsotake place through the passages 35 and 36 and through the valve chest tothe atmosphere.

In the arrangement shown the lower portion of the column 26 is in theform of a reduced stem 31 that extends through the piston 23, and ashoulder 38 at the juncture; of thestem iil and the main body of thecolumn 26 seats upon? the *..*.upperi'surface'aofsitheit iston :23.Theistem 31 extendsizbe'low .the-npiston landi .is provided withexternal threads .39: for engagement withv the ineternal lthreads 40: ofas sleeve i 4| vwhich :bears against the lower surface of the piston 23for pressing said piston firmly against the shoulder 38. I

The sleeve 4| serves as a guide element for the piston 23 and isslidable within an annular extension 42 depending from the upper wall ofthe base 2|. Sealing rings 43 in the periphery of the sleeve prevent theleakage of pressure fluid from the reservoir 29 through the exten sion42 into the lower end of the cylinder 22.

In addition to their guiding function the elements depending from thepiston 23 also constitute a raising piston for elevating thereciprocatory parts of the machine in the absence of pressure fluid inthe cylinder 22, and the surfaces of such depending portions confrontingthe reservoir 29 constitute, collectively, a pressure area 44 which isconstantly exposed to pressure fluid in the reservoir 29.

The'sleeve 4| is of greater length than the threaded portion of the stem31 and a portion of the sleeve lies below the end of said stem. Thethreaded portion of the sleeve also extends below the lower end of thestem 31 for the accommodation of a locking plate 45 that is threadedinto the sleeve to seat against the end of the stem 31 for locking thesleeve against rotary movement with respect to the column. The plate 45has an axial aperture 46 of polygonal shape for the reception of a toolwhereby the plate may be threaded against the stem 31.

In order that the lockin plate 45 may be held securely immovable in thesleeve 4| said plate is provided with a screw 41 that extends throughthe locking plate and bears with an end 48 against the end surface ofthe stem 31. The screw 41 is off-set from the axis of the locking plateso that when it is forced against the end of the stem 31 it will tiltthe locking plate relatively to the sleeve within the limits permittedby the natural clearances between the threads of the sleeve and thelocking plate. By thus exerting a force on the locking plate segmentalareas of the lower surfaces of the threads on the locking plate in thevicinity of the screw 41 will be forced into frictional engagement within the sleeve Al. The latter will thereby also be held immovable on thestem 31.

In practice, the present invention has been found to be a highlyeffective locking device for preventing relative rotary movements ofparts that are threadedly connected together, particularly when appliedto forging machines the parts of which are subjected to severe shocksand jars. In machines of this type it has heretofore been found to be anextremely difficult matter to prevent the unscrewing of the threaded elements carried by the piston assembly and the consequent damage to thesurfaces on the column serving as seats for the piston. When the partsare locked together in accordance with the teachings of the presentinvention these surfaces and the cooperating surfaces of the piston willbe able to withstand the heavy shocks to which they are subjected sincethen the piston 23 will be incapable of any movement whatsoeverrelatively to the column 26.

erate with the threads of the stem, a locking plate of the same diameteras the stem threaded into the internally threaded portion against theend surface of the stem, and a screw threaded into the locking plate inabaxial relation therewith to abut the end surface of the stem and exerta tilting effect upon the locking plate for holdin the locking plate,the stem and the body against rotative movement with respect to eachother. I a

2. A locking device, comprising a stem having an externally threadedportion, a hollow body having an internally threaded portion tocooperate with the threads of the stem and said internally threadedportion being of greater length than the threaded portion of the stem, alocking plate of the same diameter ,as the stem threaded into the saidinternally threaded portion against the end surface of the stem, and ascrew threaded into the locking plate in abaxial relation therewith toabut the end surface of the stem and exert a tilting effect upon thelocking plate within the body to hold the locking plate, the

with respect to each other.

EDWARD F. WICKENS

